Stainless Steel Coil Tube — PMI Spectroscopy Verified
Product Overview
Wenzhou Jixing Metal Materials Co., Ltd. supplies high-grade stainless steel coil tubes engineered for demanding industrial applications. Every coil tube batch undergoes mandatory Positive Material Identification (PMI) spectroscopy inspection — a rigorous verification process that ensures the declared alloy composition matches the actual material delivered. This commitment to material integrity positions our coil tubes as a trusted choice for procurement teams who require zero tolerance for material fraud or substitution.
Material & Properties
Our stainless steel coil tubes are available in a range of austenitic, ferritic, and duplex alloy grades, including but not limited to:
- 304 / 304L — Excellent general corrosion resistance, formability, and weldability
- 316 / 316L — Superior resistance to pitting and crevice corrosion due to molybdenum addition
- 321 — Stabilized against sensitization for high-temperature service
- 310S — Outstanding oxidation resistance for extreme thermal environments
- 430 / 439 — Cost-effective ferritic options for moderate corrosion environments
- 2205 Duplex — High strength and excellent chloride stress-corrosion cracking resistance
All alloys meet or exceed ASTM, ASME, EN, and JIS international standards for chemical composition, mechanical properties, and dimensional tolerances.
Specifications
| Parameter | Specification |
|---|---|
| Product Form | Coil Tube (Continuous Coil Winding) |
| Material Grades | 304, 304L, 316, 316L, 321, 310S, 430, 439, 2205, 2507, Custom |
| Outer Diameter (OD) | 6.00 mm – 159.00 mm |
| Wall Thickness | 0.50 mm – 12.00 mm |
| Coil Length per Spool | Up to 3,000 m (customizable) |
| Surface Finish | 2B, BA, No. 4, No. 8 Mirror, Custom |
| Tolerance (OD) | ±0.1 mm (standard); ±0.05 mm (precision) |
| Tolerance (WT) | ±10% of nominal |
| Standards | ASTM A213, A269, A312; EN 10216-5; JIS G3459; ASME SA-213 |
| PMI Verification | 100% Batch Inspection — XRF / Spark-OES |
| Packaging | Steel banding, wooden pallet, moisture-proof wrapping |
| Origin | Wenzhou, Zhejiang, China |
Manufacturing Process
- Raw Material Sourcing: Virgin stainless steel slabs and strips are procured from certified mills with full traceability documentation (mill test certificates, heat numbers).
- Coil Winding: Precision-wound coil tubes are formed using automated winding systems that maintain consistent diameter and wall thickness throughout the entire coil length.
- Heat Treatment (if applicable): Solution annealing and pickling/hydrogen annealing processes ensure optimal microstructure, mechanical properties, and surface cleanliness.
- Surface Finishing: Grinding, polishing, or brushing operations achieve the specified surface finish grade.
- PMI Spectroscopy Inspection: Each batch is subjected to handheld XRF (X-Ray Fluorescence) and/or spark direct-reading OES (Optical Emission Spectroscopy) analysis at the point of receipt and prior to dispatch.
- Dimensional Inspection: Outer diameter, wall thickness, and coil geometry are verified against order specifications using calibrated gauges and calipers.
- Packaging & Dispatch: Verified coils are packaged with protective wrapping, labeled with batch/heat information, and shipped with full quality documentation.
Applications
- Heat Exchangers & Boilers: Coil tubes are ideal for hairpin, spiral, and serpentine heat exchanger configurations in power generation, petrochemical, and HVAC systems.
- Pipeline & Piping Systems: Used in process piping for oil & gas, chemical processing, and water treatment facilities.
- Automotive & Aerospace: Fuel lines, exhaust systems, hydraulic lines, and structural tubing in high-performance applications.
- Food & Pharmaceutical Processing: Sanitary-grade coil tubing for hygienic fluid transfer, CIP systems, and bioreactor components.
- Energy & Solar Thermal: Absorber tubes and flow tubes in concentrated solar power (CSP) and solar water heating systems.
- Electrical & Electronics: Conduit, grounding conductors, and shielding tubes in electrical installations.
Quality Certifications & PMI Inspection Protocol
Wenzhou Jixing Metal Materials Co., Ltd. holds ISO 9001:2015 quality management system certification and maintains compliance with international material standards. Our quality assurance program is built around a zero-tolerance policy for material fraud.
PMI Spectroscopy Verification — Every Batch, No Exceptions
To safeguard our customers against material substitution, counterfeit alloys, and composition deviations, we enforce a mandatory PMI inspection protocol:
- Handheld XRF Analysis: Non-destructive, rapid alloy identification performed on incoming material and finished coils. XRF spectrometers detect elemental composition (Cr, Ni, Mo, Mn, Si, etc.) within seconds, enabling immediate grade verification.
- Spark Direct-Reading OES: Complementary destructive sampling analysis for precise quantification of carbon, nitrogen, sulfur, and other light elements that XRF may under-detect. Provides definitive chemical composition data.
- 100% Batch Coverage: Every production batch — without exception — is inspected. No batch is released for shipment without a passing PMI result.
- Immediate Isolation & Return: Any batch found to deviate from the declared alloy specification is immediately quarantined, flagged for non-conformance, and returned to the supplier for credit. No compromised material reaches the customer.
- Full Traceability: PMI test reports are archived with batch numbers, heat numbers, and timestamps, providing a complete audit trail for regulatory inspections and customer quality reviews.
Our Promise: When you purchase coil tube from Wenzhou Jixing, you receive exactly the alloy grade you specified — verified by spectroscopy, backed by documentation, and guaranteed by our quality-first culture.
Certifications & Compliance
- ISO 9001:2015 — Quality Management System
- EN 10204 3.1 — Material Test Certificates (MTC)
- ASTM / ASME / EN / JIS — Standard Conformance
- PMI Inspection Records — Available Upon Request
- Third-Party Inspection — Supported (SGS, BV, TÜV)
Why Choose Wenzhou Jixing Metal Materials
- Material Integrity Guaranteed: Industry-leading PMI spectroscopy protocol eliminates the risk of receiving wrong-grade or counterfeit stainless steel.
- Full Traceability: Every coil is traceable to its mill heat number with complete inspection records.
- Wide Grade Availability: From standard austenitic to advanced duplex alloys, all in coil tube format.
- Flexible Specifications: Custom OD, wall thickness, coil length, and surface finish to match your exact application requirements.
- Competitive Pricing: Direct-from-source pricing from Wenzhou — China's premier stainless steel manufacturing hub.
- Reliable Lead Times: In-stock inventory for common grades; expedited production for special orders.